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Acquisitions, Discontinued Operations, and Other Dispositions - Acquisitions (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 07, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business acquisition and other investments, net of cash acquired |  |  |  |  | $ 180.8 | $ 0.0 | $ 0.0
Goodwill |  |  |  | $ 394.4 | 394.4 | 345.9 | 340.4
Net loss incurred |  |  |  |  | (81.2) | (89.3) | $ 67.2
Cues, Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business acquisition and other investments, net of cash acquired | $ 164.4 | $ 164.4 |  |  |  |  |
Cash acquired | 20.6 | $ 20.6 |  |  |  |  |
Current assets, including cash and equivalents of $20.6 | 70.4 |  |  |  |  |  |
Cash and cash equivalents | 20.6 |  |  |  |  |  |
Property, plant and equipment | 7.4 |  |  |  |  |  |
Goodwill | 48.6 |  |  |  |  |  |
Intangible assets | 79.5 |  |  |  |  |  |
Other assets | 2.3 |  |  |  |  |  |
Total assets acquired | 208.2 |  |  |  |  |  |
Current liabilities assumed | 7.8 |  |  |  |  |  |
Non-current liabilities assumed | 15.4 |  |  |  |  |  |
Net assets acquired | 185.0 |  |  |  |  |  |
Gross receivables acquired | 13.6 |  |  |  |  |  |
Fair value of gross receivables acquired | 13.2 |  |  |  |  |  |
Revenues and net losses |  |  |  | 52.3 |  |  |
Net loss incurred |  |  |  | 0.4 |  |  |
Charges associated with the excess fair value over historical cost of inventory acquired |  |  |  | $ 4.3 |  |  |
Business Acquisition, Pro Forma Information [Abstract] |  |  |  |  |  |  |
Revenues |  |  |  |  | 1,572.7 | 1,511.4 |
Income from continuing operations |  |  |  |  | 87.1 | 87.4 |
Net income |  |  |  |  | $ 90.1 | $ 92.7 |
Income from continuing operations per share - Basic (usd per share) |  |  |  |  | $ 2.02 | $ 2.06 |
Income from continuing operations per share - Diluted (usd per share) |  |  |  |  | 1.95 | 1.99 |
Net income per share - Basic (usd per share) |  |  |  |  | 2.09 | 2.19 |
Net income per share - Diluted (usd per share) |  |  |  |  | $ 2.02 | $ 2.11 |
Schonstedt Instrument Company |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business acquisition and other investments, net of cash acquired |  |  | $ 16.4 |  |  |  |
Cash acquired |  |  | $ 0.3 |  |  |  |
Trademarks | Cues, Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets | 27.6 |  |  |  |  |  |
Order or Production Backlog | Cues, Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets | $ 0.8 |  |  |  |  |  |
Finite-lived intangible assets amortization period (in years) | 6 months |  |  |  |  |  |
Customer relationships | Cues, Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets | $ 42.6 |  |  |  |  |  |
Finite-lived intangible assets amortization period (in years) | 12 years |  |  |  |  |  |
Technology | Cues, Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets | $ 8.5 |  |  |  |  |  |
Finite-lived intangible assets amortization period (in years) | 11 years |  |  |  |  |  |
Selling, General and Administrative Expenses | Cues, Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquisition related costs |  |  |  |  | $ 2.4 |  |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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